astronomy

Markarian 493

Markarian 493 is a astronomy topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Markarian 493 rather than just read about it. In short: Markarian 493 or UGC 10120, is an active Seyfert galaxy of type 1 located in the constellation of Corona Borealis. The redshift of the galaxy is (z) 0.031 and it was first discovered in the radio survey by astronomers in November 1980.

Key takeaways

Markarian 493 belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Markarian 493 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Markarian 493 from memory before moving on to harder problems.

Reference excerpt

Markarian 493 or UGC 10120, is an active Seyfert galaxy of type 1 located in the constellation of Corona Borealis. The redshift of the galaxy is (z) 0.031 and it was first discovered in the radio survey by astronomers in November 1980.

Description Markarian 493 is depicted as a face-on barred spiral galaxy of type SBb. The morphology of the galaxy is very similar to something like MRK 42, with a bright central nucleus present and star formation regions in a form of a tightly wound spiral. Imaging also showed a bar and ring structure is present in the galaxy. The nucleus of Markarian 493 is active and it has been categorized as a narrow-line Seyfert galaxy based on its spectrum. When observed with the Very Large Array (VLA), the source of the galaxy is mainly weak with a component that is unresolved. There is minimal optical polarization of 26%. In 2024, a central component is located with it being mainly surrounded by emission that is faint and extended. There is also a core component with a steep flux spectrum at 9 GHz frequencies. A study published in 2008, has found the presence of a circumnuclear ring inside its central region. The ring has a total radius of between 350 and 500 parsecs with traces of continuum emission originating from emission-line gas. The star formation rate inside the ring is calculated to be around 2 M☉ per year, with a Hydrogen-alpha luminosity being 6.7 × 1041 erg s−1. In addition, there are multiple dust spiral arms located outside the ring region. The central supermassive black hole for this galaxy is estimated to be 1.5 × 106 M☉.

References

External links Markarian 493 on SIMBAD Markarian 493 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images

Illustrations

Worked examples

Example 1 — a first encounter with Markarian 493

Start with the simplest possible case. Write down what Markarian 493 claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In astronomy, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Markarian 493 before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Markarian 493 ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Markarian 493

In research: Markarian 493 appears in astronomy research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Markarian 493 in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Markarian 493 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Active galaxies, Astronomical objects discovered in 1980, Barred spiral galaxies, so understanding it makes those chapters shorter.
In everyday life: Look for Markarian 493 outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Markarian 493 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Markarian 493 means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Markarian 493 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Markarian 493 in simple terms?

Why does Markarian 493 matter?

Because it connects several astronomy ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Markarian 493?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Markarian 493.